The iMac “Core i5” 3.2 27-Inch Aluminum (Retina 5K, Late 2015/Skylake) features a 14-nm “Skylake” open space interior 3.2 GHz Intel “Core i5” processor (6500).This model has a 27" 5120x2880 LED-backlit 16:9 widescreen IPS DCI-P3 "Retina 5K" display. The rear of the case is aluminum and is thicker in the middle and tapers to a razor thin 5 mm at the edges.